@misc{cryptoeprint:2006:433,
author = {Reihaneh Safavi-Naini and Peter Wild},
title = {Information Theoretic Bounds on Authentication Systems in Query Model},
howpublished = {Cryptology ePrint Archive, Report 2006/433},
year = {2006},
note = {\url{http://eprint.iacr.org/}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.